This video from Britain says about itself:
4 February 2013
The ‘Special Demonstrations Squad‘ are reported to have been under-cover police officers who infiltrated protest groups from the late 1960’s to the mid 1990’s- and it is claimed by Scotland Yard that the Squad had now ‘disbanded’.
By Sam Tobin in Britain:
Thursday, May 24, 2018
TWO more undercover police officers had their cover names published by the spycops inquiry yesterday.
Matt Rayner, known as HN1, infiltrated animal rights groups including the Animal Liberation Front and West London Hunt Saboteurs between 1991 and 1996 while using the identity of a dead boy.
The former spycop has previously been accused of encouraging and helping animal rights campaigner Geoff Sheppard to commit illegal acts for which he was jailed for four years.
Mr Sheppard was previously convicted for planting incendiary devices in branches of department store Debenhams in 1987.
Green Party MP Caroline Lucas used parliamentary privilege in 2012 to name Bob Lambert as the undercover police officer who allegedly planted a third device in Harrow, north London, to help convict him.
The undercover policing inquiry also released the cover name of Mike Hartley, known as HN12, who infiltrated the Revolutionary Communist Group and the Socialist Workers Party between 1982 and 1985.